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itung sndiri diperoleh
p= 2/15
sigma batas 22..25 (2-pk) = 8 - 94p = 28/3
sigma batas 2..4 (2-pk) = 6 - 9p = 24/5
batas 2..21 = batas 5..25 - batas 22..25 + batas 2..4
= 0 - 28/3 + 24/5
samakan pnyebut nnti dperoleh
= -68/15